/*
* FileSaver.js
* A saveAs() FileSaver implementation.
*
* By Eli Grey, http://eligrey.com
*
* License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
* source  : http://purl.eligrey.com/github/FileSaver.js
*/

// The one and only way of getting global scope in all environments
// https://stackoverflow.com/q/3277182/1008999
layui.define(["jquery"], function (exports) {
    var jQuery = layui.jquery;

    var obj = (function($) {

        var _global = typeof window === 'object' && window.window === window
            ? window : typeof self === 'object' && self.self === self
                ? self : typeof global === 'object' && global.global === global
                    ? global
                    : this

        function bom (blob, opts) {
            if (typeof opts === 'undefined') opts = { autoBom: false }
            else if (typeof opts !== 'object') {
                console.warn('Deprecated: Expected third argument to be a object')
                opts = { autoBom: !opts }
            }

            // prepend BOM for UTF-8 XML and text/* types (including HTML)
            // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
            if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
                return new Blob([String.fromCharCode(0xFEFF), blob], { type: blob.type })
            }
            return blob
        }

        function download (url, name, opts) {
            var xhr = new XMLHttpRequest()
            xhr.open('GET', url)
            xhr.responseType = 'blob'
            xhr.onload = function () {
                saveAs(xhr.response, name, opts)
            }
            xhr.onerror = function () {
                console.error('could not download file')
            }
            xhr.send()
        }

        function corsEnabled (url) {
            var xhr = new XMLHttpRequest()
            // use sync to avoid popup blocker
            xhr.open('HEAD', url, false)
            try {
                xhr.send()
            } catch (e) {}
            return xhr.status >= 200 && xhr.status <= 299
        }

        // `a.click()` doesn't work for all browsers (#465)
        function click (node) {
            try {
                node.dispatchEvent(new MouseEvent('click'))
            } catch (e) {
                var evt = document.createEvent('MouseEvents')
                evt.initMouseEvent('click', true, true, window, 0, 0, 0, 80,
                    20, false, false, false, false, 0, null)
                node.dispatchEvent(evt)
            }
        }

        // Detect WebView inside a native macOS app by ruling out all browsers
        // We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
        // https://www.whatismybrowser.com/guides/the-latest-user-agent/macos
        var isMacOSWebView = /Macintosh/.test(navigator.userAgent) && /AppleWebKit/.test(navigator.userAgent) && !/Safari/.test(navigator.userAgent)

        var saveAs = _global.saveAs || (
            // probably in some web worker
            (typeof window !== 'object' || window !== _global)
                ? function saveAs () { /* noop */ }

                // Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
                : ('download' in HTMLAnchorElement.prototype && !isMacOSWebView)
                    ? function saveAs (blob, name, opts) {
                        var URL = _global.URL || _global.webkitURL
                        var a = document.createElement('a')
                        name = name || blob.name || 'download'

                        a.download = name
                        a.rel = 'noopener' // tabnabbing

                        // TODO: detect chrome extensions & packaged apps
                        // a.target = '_blank'

                        if (typeof blob === 'string') {
                            // Support regular links
                            a.href = blob
                            if (a.origin !== location.origin) {
                                corsEnabled(a.href)
                                    ? download(blob, name, opts)
                                    : click(a, a.target = '_blank')
                            } else {
                                click(a)
                            }
                        } else {
                            // Support blobs
                            a.href = URL.createObjectURL(blob)
                            setTimeout(function () { URL.revokeObjectURL(a.href) }, 4E4) // 40s
                            setTimeout(function () { click(a) }, 0)
                        }
                    }

                    // Use msSaveOrOpenBlob as a second approach
                    : 'msSaveOrOpenBlob' in navigator
                        ? function saveAs (blob, name, opts) {
                            name = name || blob.name || 'download'

                            if (typeof blob === 'string') {
                                if (corsEnabled(blob)) {
                                    download(blob, name, opts)
                                } else {
                                    var a = document.createElement('a')
                                    a.href = blob
                                    a.target = '_blank'
                                    setTimeout(function () { click(a) })
                                }
                            } else {
                                navigator.msSaveOrOpenBlob(bom(blob, opts), name)
                            }
                        }

                        // Fallback to using FileReader and a popup
                        : function saveAs (blob, name, opts, popup) {
                            // Open a popup immediately do go around popup blocker
                            // Mostly only available on user interaction and the fileReader is async so...
                            popup = popup || open('', '_blank')
                            if (popup) {
                                popup.document.title =
                                    popup.document.body.innerText = 'downloading...'
                            }

                            if (typeof blob === 'string') return download(blob, name, opts)

                            var force = blob.type === 'application/octet-stream'
                            var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari
                            var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent)

                            if ((isChromeIOS || (force && isSafari) || isMacOSWebView) && typeof FileReader !== 'undefined') {
                                // Safari doesn't allow downloading of blob URLs
                                var reader = new FileReader()
                                reader.onloadend = function () {
                                    var url = reader.result
                                    url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, 'data:attachment/file;')
                                    if (popup) popup.location.href = url
                                    else location = url
                                    popup = null // reverse-tabnabbing #460
                                }
                                reader.readAsDataURL(blob)
                            } else {
                                var URL = _global.URL || _global.webkitURL
                                var url = URL.createObjectURL(blob)
                                if (popup) popup.location = url
                                else location.href = url
                                popup = null // reverse-tabnabbing #460
                                setTimeout(function () { URL.revokeObjectURL(url) }, 4E4) // 40s
                            }
                        }
        )

        _global.saveAs = saveAs.saveAs = saveAs

        if (typeof module !== 'undefined') {
            module.exports = saveAs;
        }
    })(jQuery);

    exports("FileSaver", obj);
});

